v3.25.1
Note 1 - Organization (Details Textual) - USD ($)
 3 Months Ended
Jan. 05, 2024
Mar. 31, 2025
Mar. 31, 2024
Shares of Stock Classifed as Temporary Equity Surrendered During Reporting Period (in shares)   57,400,000 4,000
Value of Stock Classified as Temporary Equity Surrendered During Reporting Period   $ 2,900,294,791 $ 100,000
Stock Issued During Period, Shares, New Issues (in shares)   100,440,000 442,400,000
Sponsors Fee Annualized Accrual Rate Based on Daily Net Asset Value 0.25% 0.25%  
BlackRock Financial Management, Inc. [Member]      
Shares of Stock Classifed as Temporary Equity Surrendered During Reporting Period (in shares) 4,000    
Value of Stock Classified as Temporary Equity Surrendered During Reporting Period $ 100,000    
Shares Redeemed, Price Per Share (in dollars per share) $ 25    
Stock Issued During Period, Shares, New Issues (in shares) 400,000    
Shares Issued, Price Per Share (in dollars per share) $ 25    
Stock Issued During Period, Value, New Issues $ 10,000,000